<?php

echo "00112233445566";
echo "<br>";
$mac = "00112233445566" ;
$mac = substr_replace($mac,":",2,0);
$mac = substr_replace($mac,":",5,0);
$mac = substr_replace($mac,":",8,0);
$mac = substr_replace($mac,":",11,0);
$mac = substr_replace($mac,":",14,0);
$mac = substr_replace($mac,":",17,0);
echo $mac;
?>
